using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.Linq.Expressions;

static class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{
    private int N, D, T;
    private int[] X;
    private void Scan()
    {
        var line = Console.ReadLine().Split(' ');
        N = int.Parse(line[0]);
        D = int.Parse(line[1]);
        T = int.Parse(line[2]);
        X = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
    }

    public void Solve()
    {
        Scan();
        Array.Sort(X);
        long ans = N;
        for (int i = 0; i < N; i++)
        {
            bool flag = false;
            for (int j = i - 1; j >= 0; j--)
            {
                if ((X[i] - X[j]) % D == 0)
                {
                    int f = (X[i] - X[j]) / D;
                    if (f / 2 <= T)
                    {
                        ans += f - 1;
                        flag = true;
                        break;
                    }
                }
            }
            if (!flag)
            {
                ans += T;
            }
            flag = false;
            for(int j = i + 1; j < N; j++)
            {
                if ((X[j] - X[i]) % D == 0)
                {
                    int f = (X[j] - X[i]) / D;
                    if (f / 2 <= T)
                    {
                        flag = true;
                        break;
                    }
                }
            }
            if (!flag)
            {
                ans += T;
            }
        }
        Console.WriteLine(ans);
    }
}